Girls who receive the HPV vaccine, Gardasil, do not become more sexually active, researchers from Kaiser Permanente reported in the journal Pediatrics. The authors added that the HPV vaccine is not associated with a higher incidence of STIs (sexually transmitted infections), contraceptive counseling, or pregnancy. The CDC (Centers for Disease Control and Prevention) has recommended that females aged 11 years be administered three doses of the vaccine to protect them from the human papillomavirus (HPV).